look out verb4 •To be vigilant and aware often as an imperative to alert a person to danger.While you're in the city center, look out for the dodgy street vendors. •To be facing.A spacious room that looks out on the sea. •(informal) Ellipsis of look out for (someone)Hey man, I know it costs four dollars but I only have three. Can you please look out? •To find by looking: to hunt out.Morgan pulled a Greek lexicon toward him (he used a Greek-German), to look out a word, instead of asking it of Pemberton. — 1891 formslooked out · looking out · looks out